System Administrator (Kharkiv, Lviv - hybrid)

CHI Software is a global software development services provider delivering AI-driven solutions, cloud services, data engineering across EdTech, FinTech and HealthTech. We help businesses modernize, scale and unlock new value through the latest technologies.
We are looking for a System Administrator

Requirements

2+ years of professional experience as a System Administrator.
Solid administration skills in Debian/Ubuntu and Windows Server.
Hands-on experience with Microsoft 365 (Admin Center, Exchange Online, Entra ID).
Experience with MDM platforms (Intune or analogs).
Experience working with Proxmox or other hypervisor/virtualization systems.
Strong networking fundamentals: TCP/IP, DNS, DHCP, VLAN, routing, and NAT.
Experience configuring firewalls (iptables/nftables or hardware firewalls).
Experience setting up and supporting VPN solutions (OpenVPN / IPsec).
Good understanding of SSL/TLS and experience with certificate lifecycle management (Let’s Encrypt, deployment, renewal).
Experience setting up monitoring tools (Zabbix, Grafana, Prometheus, or analogs).
Attention to detail regarding access controls and a disciplined habit of documenting completed tasks.

Responsibilities

Administering Debian and Ubuntu Linux servers, as well as Windows Server environments (Active Directory, Group Policies).
Managing Microsoft 365: user accounts, licenses, Exchange Online, Teams, SharePoint, OneDrive, and security configurations.
Managing employee endpoints via MDM solutions (Intune or analogs): laptop and mobile enrollment, security policies, and software deployment.
Maintaining Proxmox virtualization: creating and maintaining virtual machines, backups, and updates.
Maintaining core networking infrastructure: DNS, DHCP, switches, routers, firewalls, and Wi-Fi.
Configuring and maintaining VPN tunnels for secure remote employee access and site-to-site connections (OpenVPN / IPsec).
Managing company domain DNS records, issuing, and timely renewing SSL/TLS certificates.
Setting up and scaling infrastructure monitoring, and performing incident response.
Maintaining comprehensive technical documentation for infrastructure and processes.

Will be a plus

Experience with cloud platforms such as AWS or Azure.
Experience working with Cloudflare (DNS, proxy, security settings), Docker, GitLab.
Experience working with Jira and Confluence.